Concrete mixing device



FIG. 1 is a front perspective view of the design of a concrete mixing device showing the new design;

FIG. 2 is a rear perspective view of the concrete mixing device shown in FIG. 1;

FIG. 3 is a rear elevational view of the concrete mixing device shown in FIG. 1;

FIG. 4 is a front elevational view of the concrete mixing device shown in FIG. 1;

FIG. 5 is a left side elevational view of the concrete mixing device shown in FIG. 1;

FIG. 6 is a right side elevational view of the concrete mixing device shown in FIG. 1; and,

FIG. 7 is a top plan view of the concrete mixing device shown in FIG. 1; and,

FIG. 8 is a bottom plan view of the concrete mixing device shown in FIG. 1.

The broken lines shown in the drawing views are included for the purpose of showing environmental structure that forms no part of the claimed design. 

CLAIM The ornamental design for a concrete mixing device, as shown and described. 